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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * UDP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * Based on linux/ipv4/udp.c | |
9 | * | |
1da177e4 LT |
10 | * Fixes: |
11 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
12 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
13 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
14 | * a single port at the same time. | |
15 | * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data | |
16 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or | |
19 | * modify it under the terms of the GNU General Public License | |
20 | * as published by the Free Software Foundation; either version | |
21 | * 2 of the License, or (at your option) any later version. | |
22 | */ | |
23 | ||
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/ipv6.h> | |
33 | #include <linux/icmpv6.h> | |
34 | #include <linux/init.h> | |
1781f7f5 | 35 | #include <linux/module.h> |
3305b80c | 36 | #include <linux/skbuff.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
1da177e4 LT |
38 | #include <asm/uaccess.h> |
39 | ||
496611d7 | 40 | #include <net/addrconf.h> |
1da177e4 LT |
41 | #include <net/ndisc.h> |
42 | #include <net/protocol.h> | |
43 | #include <net/transp_v6.h> | |
44 | #include <net/ip6_route.h> | |
1da177e4 | 45 | #include <net/raw.h> |
c752f073 | 46 | #include <net/tcp_states.h> |
1da177e4 LT |
47 | #include <net/ip6_checksum.h> |
48 | #include <net/xfrm.h> | |
72289b96 | 49 | #include <net/inet6_hashtables.h> |
076bb0c8 | 50 | #include <net/busy_poll.h> |
e32ea7e7 | 51 | #include <net/sock_reuseport.h> |
1da177e4 LT |
52 | |
53 | #include <linux/proc_fs.h> | |
54 | #include <linux/seq_file.h> | |
22911fc5 | 55 | #include <trace/events/skb.h> |
ba4e58ec | 56 | #include "udp_impl.h" |
1da177e4 | 57 | |
6eada011 ED |
58 | static u32 udp6_ehashfn(const struct net *net, |
59 | const struct in6_addr *laddr, | |
60 | const u16 lport, | |
61 | const struct in6_addr *faddr, | |
62 | const __be16 fport) | |
b50026b5 | 63 | { |
1bbdceef HFS |
64 | static u32 udp6_ehash_secret __read_mostly; |
65 | static u32 udp_ipv6_hash_secret __read_mostly; | |
66 | ||
67 | u32 lhash, fhash; | |
68 | ||
69 | net_get_random_once(&udp6_ehash_secret, | |
70 | sizeof(udp6_ehash_secret)); | |
71 | net_get_random_once(&udp_ipv6_hash_secret, | |
72 | sizeof(udp_ipv6_hash_secret)); | |
73 | ||
74 | lhash = (__force u32)laddr->s6_addr32[3]; | |
75 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); | |
76 | ||
b50026b5 | 77 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
1bbdceef | 78 | udp_ipv6_hash_secret + net_hash_mix(net)); |
b50026b5 HFS |
79 | } |
80 | ||
6eada011 ED |
81 | static u32 udp6_portaddr_hash(const struct net *net, |
82 | const struct in6_addr *addr6, | |
83 | unsigned int port) | |
d4cada4a ED |
84 | { |
85 | unsigned int hash, mix = net_hash_mix(net); | |
86 | ||
87 | if (ipv6_addr_any(addr6)) | |
88 | hash = jhash_1word(0, mix); | |
856540ee | 89 | else if (ipv6_addr_v4mapped(addr6)) |
0eae88f3 | 90 | hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); |
d4cada4a | 91 | else |
0eae88f3 | 92 | hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); |
d4cada4a ED |
93 | |
94 | return hash ^ port; | |
95 | } | |
96 | ||
6ba5a3c5 | 97 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 98 | { |
30fff923 ED |
99 | unsigned int hash2_nulladdr = |
100 | udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); | |
9a52e97e | 101 | unsigned int hash2_partial = |
efe4208f | 102 | udp6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
30fff923 | 103 | |
d4cada4a | 104 | /* precompute partial secondary hash */ |
30fff923 ED |
105 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
106 | return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); | |
1da177e4 LT |
107 | } |
108 | ||
719f8358 ED |
109 | static void udp_v6_rehash(struct sock *sk) |
110 | { | |
111 | u16 new_hash = udp6_portaddr_hash(sock_net(sk), | |
efe4208f | 112 | &sk->sk_v6_rcv_saddr, |
719f8358 ED |
113 | inet_sk(sk)->inet_num); |
114 | ||
115 | udp_lib_rehash(sk, new_hash); | |
116 | } | |
117 | ||
645ca708 ED |
118 | static inline int compute_score(struct sock *sk, struct net *net, |
119 | unsigned short hnum, | |
88440ae7 BS |
120 | const struct in6_addr *saddr, __be16 sport, |
121 | const struct in6_addr *daddr, __be16 dport, | |
645ca708 ED |
122 | int dif) |
123 | { | |
60c04aec JP |
124 | int score; |
125 | struct inet_sock *inet; | |
126 | ||
127 | if (!net_eq(sock_net(sk), net) || | |
128 | udp_sk(sk)->udp_port_hash != hnum || | |
129 | sk->sk_family != PF_INET6) | |
130 | return -1; | |
131 | ||
132 | score = 0; | |
133 | inet = inet_sk(sk); | |
134 | ||
135 | if (inet->inet_dport) { | |
136 | if (inet->inet_dport != sport) | |
137 | return -1; | |
138 | score++; | |
139 | } | |
140 | ||
141 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { | |
142 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
143 | return -1; | |
144 | score++; | |
145 | } | |
146 | ||
147 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { | |
148 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
149 | return -1; | |
150 | score++; | |
151 | } | |
152 | ||
153 | if (sk->sk_bound_dev_if) { | |
154 | if (sk->sk_bound_dev_if != dif) | |
155 | return -1; | |
156 | score++; | |
645ca708 | 157 | } |
60c04aec | 158 | |
70da268b ED |
159 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
160 | score++; | |
161 | ||
645ca708 ED |
162 | return score; |
163 | } | |
164 | ||
fddc17de | 165 | static inline int compute_score2(struct sock *sk, struct net *net, |
60c04aec JP |
166 | const struct in6_addr *saddr, __be16 sport, |
167 | const struct in6_addr *daddr, | |
168 | unsigned short hnum, int dif) | |
fddc17de | 169 | { |
60c04aec JP |
170 | int score; |
171 | struct inet_sock *inet; | |
fddc17de | 172 | |
60c04aec JP |
173 | if (!net_eq(sock_net(sk), net) || |
174 | udp_sk(sk)->udp_port_hash != hnum || | |
175 | sk->sk_family != PF_INET6) | |
176 | return -1; | |
fddc17de | 177 | |
60c04aec JP |
178 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) |
179 | return -1; | |
180 | ||
181 | score = 0; | |
182 | inet = inet_sk(sk); | |
183 | ||
184 | if (inet->inet_dport) { | |
185 | if (inet->inet_dport != sport) | |
186 | return -1; | |
187 | score++; | |
188 | } | |
189 | ||
190 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { | |
191 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
fddc17de | 192 | return -1; |
60c04aec | 193 | score++; |
fddc17de | 194 | } |
60c04aec JP |
195 | |
196 | if (sk->sk_bound_dev_if) { | |
197 | if (sk->sk_bound_dev_if != dif) | |
198 | return -1; | |
199 | score++; | |
200 | } | |
201 | ||
70da268b ED |
202 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
203 | score++; | |
204 | ||
fddc17de ED |
205 | return score; |
206 | } | |
207 | ||
fddc17de ED |
208 | /* called with read_rcu_lock() */ |
209 | static struct sock *udp6_lib_lookup2(struct net *net, | |
210 | const struct in6_addr *saddr, __be16 sport, | |
211 | const struct in6_addr *daddr, unsigned int hnum, int dif, | |
1134158b CG |
212 | struct udp_hslot *hslot2, unsigned int slot2, |
213 | struct sk_buff *skb) | |
fddc17de ED |
214 | { |
215 | struct sock *sk, *result; | |
72289b96 TH |
216 | int score, badness, matches = 0, reuseport = 0; |
217 | u32 hash = 0; | |
fddc17de | 218 | |
fddc17de ED |
219 | result = NULL; |
220 | badness = -1; | |
ca065d0c | 221 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
fddc17de ED |
222 | score = compute_score2(sk, net, saddr, sport, |
223 | daddr, hnum, dif); | |
224 | if (score > badness) { | |
72289b96 TH |
225 | reuseport = sk->sk_reuseport; |
226 | if (reuseport) { | |
b50026b5 HFS |
227 | hash = udp6_ehashfn(net, daddr, hnum, |
228 | saddr, sport); | |
ed0dfffd | 229 | |
ca065d0c | 230 | result = reuseport_select_sock(sk, hash, skb, |
ed0dfffd | 231 | sizeof(struct udphdr)); |
ca065d0c ED |
232 | if (result) |
233 | return result; | |
72289b96 | 234 | matches = 1; |
70da268b | 235 | } |
ca065d0c ED |
236 | result = sk; |
237 | badness = score; | |
72289b96 TH |
238 | } else if (score == badness && reuseport) { |
239 | matches++; | |
8fc54f68 | 240 | if (reciprocal_scale(hash, matches) == 0) |
72289b96 TH |
241 | result = sk; |
242 | hash = next_pseudo_random32(hash); | |
fddc17de ED |
243 | } |
244 | } | |
fddc17de ED |
245 | return result; |
246 | } | |
247 | ||
ca065d0c | 248 | /* rcu_read_lock() must be held */ |
fce82338 | 249 | struct sock *__udp6_lib_lookup(struct net *net, |
88440ae7 BS |
250 | const struct in6_addr *saddr, __be16 sport, |
251 | const struct in6_addr *daddr, __be16 dport, | |
538950a1 CG |
252 | int dif, struct udp_table *udptable, |
253 | struct sk_buff *skb) | |
1da177e4 | 254 | { |
271b72c7 | 255 | struct sock *sk, *result; |
1da177e4 | 256 | unsigned short hnum = ntohs(dport); |
fddc17de ED |
257 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
258 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
72289b96 TH |
259 | int score, badness, matches = 0, reuseport = 0; |
260 | u32 hash = 0; | |
645ca708 | 261 | |
fddc17de ED |
262 | if (hslot->count > 10) { |
263 | hash2 = udp6_portaddr_hash(net, daddr, hnum); | |
264 | slot2 = hash2 & udptable->mask; | |
265 | hslot2 = &udptable->hash2[slot2]; | |
266 | if (hslot->count < hslot2->count) | |
267 | goto begin; | |
268 | ||
269 | result = udp6_lib_lookup2(net, saddr, sport, | |
270 | daddr, hnum, dif, | |
1134158b | 271 | hslot2, slot2, skb); |
fddc17de ED |
272 | if (!result) { |
273 | hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); | |
274 | slot2 = hash2 & udptable->mask; | |
275 | hslot2 = &udptable->hash2[slot2]; | |
276 | if (hslot->count < hslot2->count) | |
277 | goto begin; | |
278 | ||
1223c67c JBD |
279 | result = udp6_lib_lookup2(net, saddr, sport, |
280 | &in6addr_any, hnum, dif, | |
1134158b | 281 | hslot2, slot2, skb); |
fddc17de | 282 | } |
fddc17de ED |
283 | return result; |
284 | } | |
271b72c7 ED |
285 | begin: |
286 | result = NULL; | |
287 | badness = -1; | |
ca065d0c | 288 | sk_for_each_rcu(sk, &hslot->head) { |
645ca708 ED |
289 | score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
290 | if (score > badness) { | |
72289b96 TH |
291 | reuseport = sk->sk_reuseport; |
292 | if (reuseport) { | |
b50026b5 HFS |
293 | hash = udp6_ehashfn(net, daddr, hnum, |
294 | saddr, sport); | |
ca065d0c | 295 | result = reuseport_select_sock(sk, hash, skb, |
538950a1 | 296 | sizeof(struct udphdr)); |
ca065d0c ED |
297 | if (result) |
298 | return result; | |
72289b96 TH |
299 | matches = 1; |
300 | } | |
ca065d0c ED |
301 | result = sk; |
302 | badness = score; | |
72289b96 TH |
303 | } else if (score == badness && reuseport) { |
304 | matches++; | |
8fc54f68 | 305 | if (reciprocal_scale(hash, matches) == 0) |
72289b96 TH |
306 | result = sk; |
307 | hash = next_pseudo_random32(hash); | |
1da177e4 LT |
308 | } |
309 | } | |
1da177e4 LT |
310 | return result; |
311 | } | |
fce82338 | 312 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 313 | |
607c4aaf KK |
314 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
315 | __be16 sport, __be16 dport, | |
645ca708 | 316 | struct udp_table *udptable) |
607c4aaf | 317 | { |
23542618 | 318 | struct sock *sk; |
b71d1d42 | 319 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 320 | |
e5d08d71 IM |
321 | sk = skb_steal_sock(skb); |
322 | if (unlikely(sk)) | |
23542618 | 323 | return sk; |
adf30907 ED |
324 | return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
325 | &iph->daddr, dport, inet6_iif(skb), | |
538950a1 | 326 | udptable, skb); |
607c4aaf KK |
327 | } |
328 | ||
63058308 TH |
329 | struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, |
330 | __be16 sport, __be16 dport) | |
331 | { | |
332 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
333 | const struct net_device *dev = | |
334 | skb_dst(skb) ? skb_dst(skb)->dev : skb->dev; | |
335 | ||
336 | return __udp6_lib_lookup(dev_net(dev), &iph->saddr, sport, | |
337 | &iph->daddr, dport, inet6_iif(skb), | |
338 | &udp_table, skb); | |
339 | } | |
340 | EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); | |
341 | ||
ca065d0c ED |
342 | /* Must be called under rcu_read_lock(). |
343 | * Does increment socket refcount. | |
344 | */ | |
345 | #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \ | |
346 | IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) | |
aa976fc0 BS |
347 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
348 | const struct in6_addr *daddr, __be16 dport, int dif) | |
349 | { | |
ca065d0c ED |
350 | struct sock *sk; |
351 | ||
352 | sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, | |
353 | dif, &udp_table, NULL); | |
354 | if (sk && !atomic_inc_not_zero(&sk->sk_refcnt)) | |
355 | sk = NULL; | |
356 | return sk; | |
aa976fc0 BS |
357 | } |
358 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
ca065d0c | 359 | #endif |
aa976fc0 | 360 | |
1da177e4 | 361 | /* |
67ba4152 IM |
362 | * This should be easy, if there is something there we |
363 | * return it, otherwise we block. | |
1da177e4 LT |
364 | */ |
365 | ||
1b784140 | 366 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
1da177e4 LT |
367 | int noblock, int flags, int *addr_len) |
368 | { | |
369 | struct ipv6_pinfo *np = inet6_sk(sk); | |
370 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 371 | struct sk_buff *skb; |
59c2cdae | 372 | unsigned int ulen, copied; |
627d2d6b | 373 | int peeked, peeking, off; |
759e5d00 HX |
374 | int err; |
375 | int is_udplite = IS_UDPLITE(sk); | |
197c949e | 376 | bool checksum_valid = false; |
f26ba175 | 377 | int is_udp4; |
8a74ad60 | 378 | bool slow; |
1da177e4 | 379 | |
1da177e4 | 380 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 381 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 382 | |
4b340ae2 | 383 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 384 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 385 | |
1da177e4 | 386 | try_again: |
627d2d6b | 387 | peeking = off = sk_peek_offset(sk, flags); |
a59322be | 388 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
3f518bf7 | 389 | &peeked, &off, &err); |
1da177e4 | 390 | if (!skb) |
627d2d6b | 391 | return err; |
1da177e4 | 392 | |
e6afc8ac | 393 | ulen = skb->len; |
59c2cdae | 394 | copied = len; |
627d2d6b | 395 | if (copied > ulen - off) |
396 | copied = ulen - off; | |
59c2cdae | 397 | else if (copied < ulen) |
1ab1457c | 398 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 399 | |
f26ba175 WY |
400 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
401 | ||
ba4e58ec | 402 | /* |
759e5d00 HX |
403 | * If checksum is needed at all, try to do it while copying the |
404 | * data. If the data is truncated, or if we only want a partial | |
405 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 406 | */ |
ba4e58ec | 407 | |
627d2d6b | 408 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) { |
197c949e ED |
409 | checksum_valid = !udp_lib_checksum_complete(skb); |
410 | if (!checksum_valid) | |
1da177e4 | 411 | goto csum_copy_err; |
ba4e58ec GR |
412 | } |
413 | ||
197c949e | 414 | if (checksum_valid || skb_csum_unnecessary(skb)) |
627d2d6b | 415 | err = skb_copy_datagram_msg(skb, off, msg, copied); |
ba4e58ec | 416 | else { |
627d2d6b | 417 | err = skb_copy_and_csum_datagram_msg(skb, off, msg); |
1da177e4 LT |
418 | if (err == -EINVAL) |
419 | goto csum_copy_err; | |
420 | } | |
22911fc5 ED |
421 | if (unlikely(err)) { |
422 | trace_kfree_skb(skb, udpv6_recvmsg); | |
979402b1 ED |
423 | if (!peeked) { |
424 | atomic_inc(&sk->sk_drops); | |
425 | if (is_udp4) | |
6aef70a8 ED |
426 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
427 | is_udplite); | |
979402b1 | 428 | else |
6aef70a8 ED |
429 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
430 | is_udplite); | |
979402b1 | 431 | } |
627d2d6b | 432 | skb_free_datagram_locked(sk, skb); |
433 | return err; | |
22911fc5 | 434 | } |
f26ba175 WY |
435 | if (!peeked) { |
436 | if (is_udp4) | |
6aef70a8 ED |
437 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
438 | is_udplite); | |
f26ba175 | 439 | else |
6aef70a8 ED |
440 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
441 | is_udplite); | |
f26ba175 | 442 | } |
cb75994e | 443 | |
3b885787 | 444 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
445 | |
446 | /* Copy the address. */ | |
447 | if (msg->msg_name) { | |
342dfc30 | 448 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 449 | sin6->sin6_family = AF_INET6; |
4bedb452 | 450 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 451 | sin6->sin6_flowinfo = 0; |
1da177e4 | 452 | |
842df073 | 453 | if (is_udp4) { |
b301e82c BH |
454 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
455 | &sin6->sin6_addr); | |
842df073 HFS |
456 | sin6->sin6_scope_id = 0; |
457 | } else { | |
4e3fd7a0 | 458 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
459 | sin6->sin6_scope_id = |
460 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 461 | inet6_iif(skb)); |
1da177e4 | 462 | } |
bceaa902 | 463 | *addr_len = sizeof(*sin6); |
1da177e4 | 464 | } |
4b261c75 HFS |
465 | |
466 | if (np->rxopt.all) | |
467 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
468 | ||
f26ba175 | 469 | if (is_udp4) { |
1da177e4 LT |
470 | if (inet->cmsg_flags) |
471 | ip_cmsg_recv(msg, skb); | |
472 | } else { | |
473 | if (np->rxopt.all) | |
4b261c75 | 474 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 475 | } |
1da177e4 | 476 | |
59c2cdae | 477 | err = copied; |
1da177e4 | 478 | if (flags & MSG_TRUNC) |
759e5d00 | 479 | err = ulen; |
1da177e4 | 480 | |
627d2d6b | 481 | __skb_free_datagram_locked(sk, skb, peeking ? -err : err); |
1da177e4 LT |
482 | return err; |
483 | ||
484 | csum_copy_err: | |
8a74ad60 | 485 | slow = lock_sock_fast(sk); |
0856f939 | 486 | if (!skb_kill_datagram(sk, skb, flags)) { |
6a5dc9e5 | 487 | if (is_udp4) { |
6aef70a8 ED |
488 | UDP_INC_STATS(sock_net(sk), |
489 | UDP_MIB_CSUMERRORS, is_udplite); | |
490 | UDP_INC_STATS(sock_net(sk), | |
491 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 492 | } else { |
6aef70a8 ED |
493 | UDP6_INC_STATS(sock_net(sk), |
494 | UDP_MIB_CSUMERRORS, is_udplite); | |
495 | UDP6_INC_STATS(sock_net(sk), | |
496 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 497 | } |
0856f939 | 498 | } |
8a74ad60 | 499 | unlock_sock_fast(sk, slow); |
1da177e4 | 500 | |
beb39db5 ED |
501 | /* starting over for a new packet, but check if we need to yield */ |
502 | cond_resched(); | |
9cfaa8de | 503 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
504 | goto try_again; |
505 | } | |
506 | ||
ba4e58ec | 507 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 508 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 509 | struct udp_table *udptable) |
1da177e4 LT |
510 | { |
511 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
512 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
513 | const struct in6_addr *saddr = &hdr->saddr; | |
514 | const struct in6_addr *daddr = &hdr->daddr; | |
67ba4152 | 515 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
1da177e4 | 516 | struct sock *sk; |
e0d8c1b7 | 517 | int harderr; |
1da177e4 | 518 | int err; |
7304fe46 | 519 | struct net *net = dev_net(skb->dev); |
1da177e4 | 520 | |
e32ea7e7 | 521 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
538950a1 | 522 | inet6_iif(skb), udptable, skb); |
63159f29 | 523 | if (!sk) { |
a16292a0 ED |
524 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
525 | ICMP6_MIB_INERRORS); | |
1da177e4 | 526 | return; |
7304fe46 | 527 | } |
1da177e4 | 528 | |
e0d8c1b7 WW |
529 | harderr = icmpv6_err_convert(type, code, &err); |
530 | np = inet6_sk(sk); | |
531 | ||
93b36cf3 HFS |
532 | if (type == ICMPV6_PKT_TOOBIG) { |
533 | if (!ip6_sk_accept_pmtu(sk)) | |
534 | goto out; | |
81aded24 | 535 | ip6_sk_update_pmtu(skb, sk, info); |
e0d8c1b7 WW |
536 | if (np->pmtudisc != IPV6_PMTUDISC_DONT) |
537 | harderr = 1; | |
93b36cf3 | 538 | } |
1a462d18 | 539 | if (type == NDISC_REDIRECT) { |
ec18d9a2 | 540 | ip6_sk_redirect(skb, sk); |
1a462d18 DJ |
541 | goto out; |
542 | } | |
81aded24 | 543 | |
e0d8c1b7 WW |
544 | if (!np->recverr) { |
545 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
546 | goto out; | |
547 | } else { | |
1da177e4 | 548 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
e0d8c1b7 | 549 | } |
b1faf566 | 550 | |
1da177e4 LT |
551 | sk->sk_err = err; |
552 | sk->sk_error_report(sk); | |
553 | out: | |
ca065d0c | 554 | return; |
1da177e4 LT |
555 | } |
556 | ||
f7ad74fe BL |
557 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
558 | { | |
559 | int rc; | |
560 | ||
efe4208f | 561 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 562 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 563 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 564 | sk_incoming_cpu_update(sk); |
005ec974 | 565 | } |
f7ad74fe | 566 | |
e6afc8ac | 567 | rc = __sock_queue_rcv_skb(sk, skb); |
f7ad74fe BL |
568 | if (rc < 0) { |
569 | int is_udplite = IS_UDPLITE(sk); | |
570 | ||
571 | /* Note that an ENOMEM error is charged twice */ | |
572 | if (rc == -ENOMEM) | |
e61da9e2 | 573 | UDP6_INC_STATS(sock_net(sk), |
02c22347 | 574 | UDP_MIB_RCVBUFERRORS, is_udplite); |
e61da9e2 | 575 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
f7ad74fe BL |
576 | kfree_skb(skb); |
577 | return -1; | |
578 | } | |
579 | return 0; | |
580 | } | |
581 | ||
ba4e58ec | 582 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba | 583 | struct inet6_skb_parm *opt, u8 type, |
67ba4152 | 584 | u8 code, int offset, __be32 info) |
ba4e58ec | 585 | { |
645ca708 | 586 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
587 | } |
588 | ||
d7f3f621 BL |
589 | static struct static_key udpv6_encap_needed __read_mostly; |
590 | void udpv6_encap_enable(void) | |
591 | { | |
592 | if (!static_key_enabled(&udpv6_encap_needed)) | |
593 | static_key_slow_inc(&udpv6_encap_needed); | |
594 | } | |
595 | EXPORT_SYMBOL(udpv6_encap_enable); | |
596 | ||
f7ad74fe | 597 | int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 598 | { |
ba4e58ec | 599 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 600 | int rc; |
b2bf1e26 | 601 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 602 | |
ba4e58ec GR |
603 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
604 | goto drop; | |
1da177e4 | 605 | |
d7f3f621 BL |
606 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
607 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
608 | ||
609 | /* | |
610 | * This is an encapsulation socket so pass the skb to | |
611 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
612 | * fall through and pass this up the UDP socket. | |
613 | * up->encap_rcv() returns the following value: | |
614 | * =0 if skb was successfully passed to the encap | |
615 | * handler or was discarded by it. | |
616 | * >0 if skb should be passed on to UDP. | |
617 | * <0 if skb should be resubmitted as proto -N | |
618 | */ | |
619 | ||
620 | /* if we're overly short, let UDP handle it */ | |
621 | encap_rcv = ACCESS_ONCE(up->encap_rcv); | |
53b24b8f | 622 | if (skb->len > sizeof(struct udphdr) && encap_rcv) { |
d7f3f621 BL |
623 | int ret; |
624 | ||
0a80966b TH |
625 | /* Verify checksum before giving to encap */ |
626 | if (udp_lib_checksum_complete(skb)) | |
627 | goto csum_error; | |
628 | ||
d7f3f621 BL |
629 | ret = encap_rcv(sk, skb); |
630 | if (ret <= 0) { | |
02c22347 ED |
631 | __UDP_INC_STATS(sock_net(sk), |
632 | UDP_MIB_INDATAGRAMS, | |
633 | is_udplite); | |
d7f3f621 BL |
634 | return -ret; |
635 | } | |
636 | } | |
637 | ||
638 | /* FALLTHROUGH -- it's a UDP Packet */ | |
639 | } | |
640 | ||
ba4e58ec GR |
641 | /* |
642 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
643 | */ | |
b2bf1e26 | 644 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
645 | |
646 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
647 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
648 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
649 | goto drop; |
650 | } | |
651 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
652 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
653 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
ba4e58ec GR |
654 | goto drop; |
655 | } | |
1da177e4 LT |
656 | } |
657 | ||
33d480ce | 658 | if (rcu_access_pointer(sk->sk_filter)) { |
1ab6eb62 | 659 | if (udp_lib_checksum_complete(skb)) |
6a5dc9e5 | 660 | goto csum_error; |
e6afc8ac | 661 | if (sk_filter(sk, skb)) |
662 | goto drop; | |
1ab6eb62 | 663 | } |
ba4e58ec | 664 | |
e6afc8ac | 665 | udp_csum_pull_header(skb); |
274f482d | 666 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
02c22347 ED |
667 | __UDP6_INC_STATS(sock_net(sk), |
668 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
cb80ef46 | 669 | goto drop; |
3e215c8d | 670 | } |
cb80ef46 | 671 | |
d826eb14 | 672 | skb_dst_drop(skb); |
cb75994e | 673 | |
cb80ef46 BL |
674 | bh_lock_sock(sk); |
675 | rc = 0; | |
676 | if (!sock_owned_by_user(sk)) | |
677 | rc = __udpv6_queue_rcv_skb(sk, skb); | |
678 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { | |
679 | bh_unlock_sock(sk); | |
680 | goto drop; | |
681 | } | |
682 | bh_unlock_sock(sk); | |
f7ad74fe BL |
683 | |
684 | return rc; | |
3e215c8d | 685 | |
6a5dc9e5 | 686 | csum_error: |
02c22347 | 687 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
ba4e58ec | 688 | drop: |
02c22347 | 689 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 690 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
691 | kfree_skb(skb); |
692 | return -1; | |
1da177e4 LT |
693 | } |
694 | ||
5cf3d461 DH |
695 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
696 | __be16 loc_port, const struct in6_addr *loc_addr, | |
697 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
698 | int dif, unsigned short hnum) | |
1da177e4 | 699 | { |
5cf3d461 | 700 | struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 701 | |
5cf3d461 DH |
702 | if (!net_eq(sock_net(sk), net)) |
703 | return false; | |
704 | ||
705 | if (udp_sk(sk)->udp_port_hash != hnum || | |
706 | sk->sk_family != PF_INET6 || | |
707 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
708 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
709 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
33b4b015 HR |
710 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || |
711 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && | |
712 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
713 | return false; |
714 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
715 | return false; | |
716 | return true; | |
1da177e4 LT |
717 | } |
718 | ||
4068579e TH |
719 | static void udp6_csum_zero_error(struct sk_buff *skb) |
720 | { | |
721 | /* RFC 2460 section 8.1 says that we SHOULD log | |
722 | * this error. Well, it is reasonable. | |
723 | */ | |
ba7a46f1 JP |
724 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
725 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
726 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
727 | } |
728 | ||
1da177e4 LT |
729 | /* |
730 | * Note: called only from the BH handler context, | |
731 | * so we don't need to lock the hashes. | |
732 | */ | |
e3163493 | 733 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 734 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 735 | struct udp_table *udptable, int proto) |
1da177e4 | 736 | { |
ca065d0c | 737 | struct sock *sk, *first = NULL; |
4bedb452 | 738 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
739 | unsigned short hnum = ntohs(uh->dest); |
740 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
ca065d0c | 741 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
2dc41cff | 742 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
ca065d0c ED |
743 | int dif = inet6_iif(skb); |
744 | struct hlist_node *node; | |
745 | struct sk_buff *nskb; | |
2dc41cff DH |
746 | |
747 | if (use_hash2) { | |
748 | hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) & | |
749 | udp_table.mask; | |
750 | hash2 = udp6_portaddr_hash(net, daddr, hnum) & udp_table.mask; | |
751 | start_lookup: | |
752 | hslot = &udp_table.hash2[hash2]; | |
753 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); | |
754 | } | |
1da177e4 | 755 | |
ca065d0c ED |
756 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
757 | if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, | |
758 | uh->source, saddr, dif, hnum)) | |
759 | continue; | |
760 | /* If zero checksum and no_check is not on for | |
761 | * the socket then skip it. | |
762 | */ | |
763 | if (!uh->check && !udp_sk(sk)->no_check6_rx) | |
764 | continue; | |
765 | if (!first) { | |
766 | first = sk; | |
767 | continue; | |
768 | } | |
769 | nskb = skb_clone(skb, GFP_ATOMIC); | |
770 | if (unlikely(!nskb)) { | |
771 | atomic_inc(&sk->sk_drops); | |
02c22347 ED |
772 | __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
773 | IS_UDPLITE(sk)); | |
774 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, | |
775 | IS_UDPLITE(sk)); | |
ca065d0c | 776 | continue; |
95766fff | 777 | } |
a1ab77f9 | 778 | |
ca065d0c ED |
779 | if (udpv6_queue_rcv_skb(sk, nskb) > 0) |
780 | consume_skb(nskb); | |
781 | } | |
a1ab77f9 | 782 | |
2dc41cff DH |
783 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
784 | if (use_hash2 && hash2 != hash2_any) { | |
785 | hash2 = hash2_any; | |
786 | goto start_lookup; | |
787 | } | |
788 | ||
ca065d0c ED |
789 | if (first) { |
790 | if (udpv6_queue_rcv_skb(first, skb) > 0) | |
791 | consume_skb(skb); | |
a1ab77f9 | 792 | } else { |
ca065d0c | 793 | kfree_skb(skb); |
02c22347 ED |
794 | __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
795 | proto == IPPROTO_UDPLITE); | |
a1ab77f9 | 796 | } |
ba4e58ec | 797 | return 0; |
1da177e4 LT |
798 | } |
799 | ||
645ca708 | 800 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 801 | int proto) |
1da177e4 | 802 | { |
ca065d0c | 803 | const struct in6_addr *saddr, *daddr; |
3ffe533c | 804 | struct net *net = dev_net(skb->dev); |
1ab1457c | 805 | struct udphdr *uh; |
ca065d0c | 806 | struct sock *sk; |
1da177e4 LT |
807 | u32 ulen = 0; |
808 | ||
809 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 810 | goto discard; |
1da177e4 | 811 | |
0660e03f ACM |
812 | saddr = &ipv6_hdr(skb)->saddr; |
813 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 814 | uh = udp_hdr(skb); |
1da177e4 LT |
815 | |
816 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
817 | if (ulen > skb->len) |
818 | goto short_packet; | |
1da177e4 | 819 | |
759e5d00 HX |
820 | if (proto == IPPROTO_UDP) { |
821 | /* UDP validates ulen. */ | |
1da177e4 | 822 | |
ba4e58ec GR |
823 | /* Check for jumbo payload */ |
824 | if (ulen == 0) | |
825 | ulen = skb->len; | |
1da177e4 | 826 | |
ba4e58ec GR |
827 | if (ulen < sizeof(*uh)) |
828 | goto short_packet; | |
1da177e4 | 829 | |
ba4e58ec GR |
830 | if (ulen < skb->len) { |
831 | if (pskb_trim_rcsum(skb, ulen)) | |
832 | goto short_packet; | |
0660e03f ACM |
833 | saddr = &ipv6_hdr(skb)->saddr; |
834 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 835 | uh = udp_hdr(skb); |
ba4e58ec | 836 | } |
ba4e58ec | 837 | } |
1da177e4 | 838 | |
759e5d00 | 839 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 840 | goto csum_error; |
759e5d00 | 841 | |
1ab1457c YH |
842 | /* |
843 | * Multicast receive code | |
1da177e4 | 844 | */ |
ba4e58ec | 845 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 846 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 847 | saddr, daddr, udptable, proto); |
1da177e4 LT |
848 | |
849 | /* Unicast */ | |
850 | ||
1ab1457c | 851 | /* |
1da177e4 LT |
852 | * check socket cache ... must talk to Alan about his plans |
853 | * for sock caches... i'll skip this for now. | |
854 | */ | |
607c4aaf | 855 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 856 | if (sk) { |
a5b50476 ET |
857 | int ret; |
858 | ||
1c19448c | 859 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
4068579e TH |
860 | udp6_csum_zero_error(skb); |
861 | goto csum_error; | |
862 | } | |
863 | ||
224d019c | 864 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
2abb7cdc TH |
865 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
866 | ip6_compute_pseudo); | |
867 | ||
a5b50476 | 868 | ret = udpv6_queue_rcv_skb(sk, skb); |
1da177e4 | 869 | |
59dca1d8 | 870 | /* a return value > 0 means to resubmit the input */ |
cb80ef46 | 871 | if (ret > 0) |
59dca1d8 | 872 | return ret; |
1da177e4 | 873 | |
add459aa | 874 | return 0; |
1da177e4 | 875 | } |
1ab1457c | 876 | |
4068579e TH |
877 | if (!uh->check) { |
878 | udp6_csum_zero_error(skb); | |
879 | goto csum_error; | |
880 | } | |
881 | ||
cb80ef46 | 882 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 883 | goto discard; |
cb80ef46 BL |
884 | |
885 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 886 | goto csum_error; |
cb80ef46 | 887 | |
02c22347 | 888 | __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
cb80ef46 BL |
889 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
890 | ||
891 | kfree_skb(skb); | |
add459aa | 892 | return 0; |
1da177e4 | 893 | |
1ab1457c | 894 | short_packet: |
ba7a46f1 JP |
895 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
896 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
897 | saddr, ntohs(uh->source), | |
898 | ulen, skb->len, | |
899 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 ED |
900 | goto discard; |
901 | csum_error: | |
02c22347 | 902 | __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 903 | discard: |
02c22347 | 904 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 905 | kfree_skb(skb); |
add459aa | 906 | return 0; |
1da177e4 | 907 | } |
ba4e58ec | 908 | |
e5bbef20 | 909 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 910 | { |
645ca708 | 911 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
912 | } |
913 | ||
1da177e4 LT |
914 | /* |
915 | * Throw away all pending data and cancel the corking. Socket is locked. | |
916 | */ | |
917 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
918 | { | |
919 | struct udp_sock *up = udp_sk(sk); | |
920 | ||
36d926b9 DL |
921 | if (up->pending == AF_INET) |
922 | udp_flush_pending_frames(sk); | |
923 | else if (up->pending) { | |
1da177e4 LT |
924 | up->len = 0; |
925 | up->pending = 0; | |
926 | ip6_flush_pending_frames(sk); | |
1ab1457c | 927 | } |
1da177e4 LT |
928 | } |
929 | ||
493c6be3 | 930 | /** |
67ba4152 IM |
931 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
932 | * @sk: socket we are sending on | |
933 | * @skb: sk_buff containing the filled-in UDP header | |
934 | * (checksum field must be zeroed out) | |
493c6be3 SS |
935 | */ |
936 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
937 | const struct in6_addr *saddr, | |
938 | const struct in6_addr *daddr, int len) | |
939 | { | |
940 | unsigned int offset; | |
941 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 942 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
943 | __wsum csum = 0; |
944 | ||
d39d938c | 945 | if (!frags) { |
493c6be3 SS |
946 | /* Only one fragment on the socket. */ |
947 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
948 | skb->csum_offset = offsetof(struct udphdr, check); | |
949 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
950 | } else { | |
951 | /* | |
952 | * HW-checksum won't work as there are two or more | |
953 | * fragments on the socket so that all csums of sk_buffs | |
954 | * should be together | |
955 | */ | |
956 | offset = skb_transport_offset(skb); | |
957 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
958 | ||
959 | skb->ip_summed = CHECKSUM_NONE; | |
960 | ||
d39d938c VY |
961 | do { |
962 | csum = csum_add(csum, frags->csum); | |
963 | } while ((frags = frags->next)); | |
493c6be3 SS |
964 | |
965 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
966 | csum); | |
967 | if (uh->check == 0) | |
968 | uh->check = CSUM_MANGLED_0; | |
969 | } | |
970 | } | |
971 | ||
1da177e4 LT |
972 | /* |
973 | * Sending | |
974 | */ | |
975 | ||
d39d938c | 976 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6) |
1da177e4 | 977 | { |
d39d938c | 978 | struct sock *sk = skb->sk; |
1da177e4 | 979 | struct udphdr *uh; |
1da177e4 | 980 | int err = 0; |
b2bf1e26 | 981 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 982 | __wsum csum = 0; |
d39d938c VY |
983 | int offset = skb_transport_offset(skb); |
984 | int len = skb->len - offset; | |
1da177e4 LT |
985 | |
986 | /* | |
987 | * Create a UDP header | |
988 | */ | |
4bedb452 | 989 | uh = udp_hdr(skb); |
1958b856 DM |
990 | uh->source = fl6->fl6_sport; |
991 | uh->dest = fl6->fl6_dport; | |
d39d938c | 992 | uh->len = htons(len); |
1da177e4 LT |
993 | uh->check = 0; |
994 | ||
b2bf1e26 | 995 | if (is_udplite) |
d39d938c VY |
996 | csum = udplite_csum(skb); |
997 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ | |
4068579e TH |
998 | skb->ip_summed = CHECKSUM_NONE; |
999 | goto send; | |
1000 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
d39d938c | 1001 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
1002 | goto send; |
1003 | } else | |
d39d938c | 1004 | csum = udp_csum(skb); |
1da177e4 | 1005 | |
ba4e58ec | 1006 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 1007 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 1008 | len, fl6->flowi6_proto, csum); |
1da177e4 | 1009 | if (uh->check == 0) |
f6ab0288 | 1010 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1011 | |
493c6be3 | 1012 | send: |
d39d938c | 1013 | err = ip6_send_skb(skb); |
6ce9e7b5 ED |
1014 | if (err) { |
1015 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
6aef70a8 ED |
1016 | UDP6_INC_STATS(sock_net(sk), |
1017 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
6ce9e7b5 ED |
1018 | err = 0; |
1019 | } | |
6aef70a8 ED |
1020 | } else { |
1021 | UDP6_INC_STATS(sock_net(sk), | |
1022 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1023 | } | |
d39d938c VY |
1024 | return err; |
1025 | } | |
1026 | ||
1027 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1028 | { | |
1029 | struct sk_buff *skb; | |
1030 | struct udp_sock *up = udp_sk(sk); | |
1031 | struct flowi6 fl6; | |
1032 | int err = 0; | |
1033 | ||
1034 | if (up->pending == AF_INET) | |
1035 | return udp_push_pending_frames(sk); | |
1036 | ||
1037 | /* ip6_finish_skb will release the cork, so make a copy of | |
1038 | * fl6 here. | |
1039 | */ | |
1040 | fl6 = inet_sk(sk)->cork.fl.u.ip6; | |
1041 | ||
1042 | skb = ip6_finish_skb(sk); | |
1043 | if (!skb) | |
1044 | goto out; | |
1045 | ||
1046 | err = udp_v6_send_skb(skb, &fl6); | |
1047 | ||
1da177e4 LT |
1048 | out: |
1049 | up->len = 0; | |
1050 | up->pending = 0; | |
1051 | return err; | |
1052 | } | |
1053 | ||
1b784140 | 1054 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1055 | { |
1056 | struct ipv6_txoptions opt_space; | |
1057 | struct udp_sock *up = udp_sk(sk); | |
1058 | struct inet_sock *inet = inet_sk(sk); | |
1059 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1060 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1061 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 1062 | struct ipv6_txoptions *opt = NULL; |
45f6fad8 | 1063 | struct ipv6_txoptions *opt_to_free = NULL; |
1da177e4 | 1064 | struct ip6_flowlabel *flowlabel = NULL; |
4c9483b2 | 1065 | struct flowi6 fl6; |
1da177e4 | 1066 | struct dst_entry *dst; |
26879da5 | 1067 | struct ipcm6_cookie ipc6; |
1da177e4 LT |
1068 | int addr_len = msg->msg_namelen; |
1069 | int ulen = len; | |
1da177e4 LT |
1070 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1071 | int err; | |
987905de | 1072 | int connected = 0; |
b2bf1e26 | 1073 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1074 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
ad1e46a8 | 1075 | struct sockcm_cookie sockc; |
1da177e4 | 1076 | |
26879da5 WW |
1077 | ipc6.hlimit = -1; |
1078 | ipc6.tclass = -1; | |
1079 | ipc6.dontfrag = -1; | |
1080 | ||
1da177e4 LT |
1081 | /* destination address check */ |
1082 | if (sin6) { | |
1083 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1084 | return -EINVAL; | |
1085 | ||
1086 | switch (sin6->sin6_family) { | |
1087 | case AF_INET6: | |
1088 | if (addr_len < SIN6_LEN_RFC2133) | |
1089 | return -EINVAL; | |
1090 | daddr = &sin6->sin6_addr; | |
1091 | break; | |
1092 | case AF_INET: | |
1093 | goto do_udp_sendmsg; | |
1094 | case AF_UNSPEC: | |
1095 | msg->msg_name = sin6 = NULL; | |
1096 | msg->msg_namelen = addr_len = 0; | |
1097 | daddr = NULL; | |
1098 | break; | |
1099 | default: | |
1100 | return -EINVAL; | |
1101 | } | |
1102 | } else if (!up->pending) { | |
1103 | if (sk->sk_state != TCP_ESTABLISHED) | |
1104 | return -EDESTADDRREQ; | |
efe4208f | 1105 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1106 | } else |
1da177e4 LT |
1107 | daddr = NULL; |
1108 | ||
1109 | if (daddr) { | |
e773e4fa | 1110 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1111 | struct sockaddr_in sin; |
1112 | sin.sin_family = AF_INET; | |
c720c7e8 | 1113 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1114 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1115 | msg->msg_name = &sin; | |
1116 | msg->msg_namelen = sizeof(sin); | |
1117 | do_udp_sendmsg: | |
1118 | if (__ipv6_only_sock(sk)) | |
1119 | return -ENETUNREACH; | |
1b784140 | 1120 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1121 | } |
1122 | } | |
1123 | ||
1124 | if (up->pending == AF_INET) | |
1b784140 | 1125 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1126 | |
1127 | /* Rough check on arithmetic overflow, | |
b59e139b | 1128 | better check is made in ip6_append_data(). |
1da177e4 LT |
1129 | */ |
1130 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1131 | return -EMSGSIZE; | |
1ab1457c | 1132 | |
03485f2a | 1133 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1da177e4 LT |
1134 | if (up->pending) { |
1135 | /* | |
1136 | * There are pending frames. | |
1137 | * The socket lock must be held while it's corked. | |
1138 | */ | |
1139 | lock_sock(sk); | |
1140 | if (likely(up->pending)) { | |
1141 | if (unlikely(up->pending != AF_INET6)) { | |
1142 | release_sock(sk); | |
1143 | return -EAFNOSUPPORT; | |
1144 | } | |
1145 | dst = NULL; | |
1146 | goto do_append_data; | |
1147 | } | |
1148 | release_sock(sk); | |
1149 | } | |
1150 | ulen += sizeof(struct udphdr); | |
1151 | ||
4c9483b2 | 1152 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1153 | |
1154 | if (sin6) { | |
1155 | if (sin6->sin6_port == 0) | |
1156 | return -EINVAL; | |
1157 | ||
1958b856 | 1158 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1159 | daddr = &sin6->sin6_addr; |
1160 | ||
1161 | if (np->sndflow) { | |
4c9483b2 DM |
1162 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1163 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1164 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1165 | if (!flowlabel) |
1da177e4 | 1166 | return -EINVAL; |
1da177e4 LT |
1167 | } |
1168 | } | |
1169 | ||
1170 | /* | |
1171 | * Otherwise it will be difficult to maintain | |
1172 | * sk->sk_dst_cache. | |
1173 | */ | |
1174 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1175 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1176 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1177 | |
1178 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1179 | sin6->sin6_scope_id && | |
842df073 | 1180 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
4c9483b2 | 1181 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1182 | } else { |
1183 | if (sk->sk_state != TCP_ESTABLISHED) | |
1184 | return -EDESTADDRREQ; | |
1185 | ||
1958b856 | 1186 | fl6.fl6_dport = inet->inet_dport; |
efe4208f | 1187 | daddr = &sk->sk_v6_daddr; |
4c9483b2 | 1188 | fl6.flowlabel = np->flow_label; |
987905de | 1189 | connected = 1; |
1da177e4 LT |
1190 | } |
1191 | ||
4c9483b2 DM |
1192 | if (!fl6.flowi6_oif) |
1193 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1194 | |
4c9483b2 DM |
1195 | if (!fl6.flowi6_oif) |
1196 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1197 | |
4c9483b2 | 1198 | fl6.flowi6_mark = sk->sk_mark; |
c14ac945 | 1199 | sockc.tsflags = sk->sk_tsflags; |
51953d5b | 1200 | |
1da177e4 LT |
1201 | if (msg->msg_controllen) { |
1202 | opt = &opt_space; | |
1203 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1204 | opt->tot_len = sizeof(*opt); | |
26879da5 | 1205 | ipc6.opt = opt; |
1da177e4 | 1206 | |
26879da5 | 1207 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc); |
1da177e4 LT |
1208 | if (err < 0) { |
1209 | fl6_sock_release(flowlabel); | |
1210 | return err; | |
1211 | } | |
4c9483b2 DM |
1212 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1213 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1214 | if (!flowlabel) |
1da177e4 LT |
1215 | return -EINVAL; |
1216 | } | |
1217 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1218 | opt = NULL; | |
987905de | 1219 | connected = 0; |
1da177e4 | 1220 | } |
45f6fad8 ED |
1221 | if (!opt) { |
1222 | opt = txopt_get(np); | |
1223 | opt_to_free = opt; | |
1224 | } | |
df9890c3 YH |
1225 | if (flowlabel) |
1226 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1227 | opt = ipv6_fixup_options(&opt_space, opt); | |
26879da5 | 1228 | ipc6.opt = opt; |
1da177e4 | 1229 | |
4c9483b2 | 1230 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1231 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1232 | fl6.daddr = *daddr; |
876c7f41 | 1233 | else |
4c9483b2 DM |
1234 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1235 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1236 | fl6.saddr = np->saddr; |
1958b856 | 1237 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1238 | |
4c9483b2 | 1239 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1240 | if (final_p) |
987905de | 1241 | connected = 0; |
1da177e4 | 1242 | |
4c9483b2 DM |
1243 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1244 | fl6.flowi6_oif = np->mcast_oif; | |
987905de | 1245 | connected = 0; |
c4062dfc EH |
1246 | } else if (!fl6.flowi6_oif) |
1247 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1248 | |
4c9483b2 | 1249 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1250 | |
0e0d44ab | 1251 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
1252 | if (IS_ERR(dst)) { |
1253 | err = PTR_ERR(dst); | |
1254 | dst = NULL; | |
1da177e4 | 1255 | goto out; |
14e50e57 | 1256 | } |
1da177e4 | 1257 | |
26879da5 WW |
1258 | if (ipc6.hlimit < 0) |
1259 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); | |
1da177e4 | 1260 | |
26879da5 WW |
1261 | if (ipc6.tclass < 0) |
1262 | ipc6.tclass = np->tclass; | |
41a1f8ea | 1263 | |
1da177e4 LT |
1264 | if (msg->msg_flags&MSG_CONFIRM) |
1265 | goto do_confirm; | |
1266 | back_from_confirm: | |
1267 | ||
03485f2a VY |
1268 | /* Lockless fast path for the non-corking case */ |
1269 | if (!corkreq) { | |
1270 | struct sk_buff *skb; | |
1271 | ||
1272 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
26879da5 | 1273 | sizeof(struct udphdr), &ipc6, |
03485f2a | 1274 | &fl6, (struct rt6_info *)dst, |
26879da5 | 1275 | msg->msg_flags, &sockc); |
03485f2a VY |
1276 | err = PTR_ERR(skb); |
1277 | if (!IS_ERR_OR_NULL(skb)) | |
1278 | err = udp_v6_send_skb(skb, &fl6); | |
1279 | goto release_dst; | |
1280 | } | |
1281 | ||
1da177e4 LT |
1282 | lock_sock(sk); |
1283 | if (unlikely(up->pending)) { | |
1284 | /* The socket is already corked while preparing it. */ | |
1285 | /* ... which is an evident application bug. --ANK */ | |
1286 | release_sock(sk); | |
1287 | ||
ba7a46f1 | 1288 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1289 | err = -EINVAL; |
1290 | goto out; | |
1291 | } | |
1292 | ||
1293 | up->pending = AF_INET6; | |
1294 | ||
1295 | do_append_data: | |
26879da5 WW |
1296 | if (ipc6.dontfrag < 0) |
1297 | ipc6.dontfrag = np->dontfrag; | |
1da177e4 | 1298 | up->len += ulen; |
26879da5 WW |
1299 | err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), |
1300 | &ipc6, &fl6, (struct rt6_info *)dst, | |
1301 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc); | |
1da177e4 LT |
1302 | if (err) |
1303 | udp_v6_flush_pending_frames(sk); | |
1304 | else if (!corkreq) | |
4c0a6cb0 | 1305 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1306 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1307 | up->pending = 0; | |
1da177e4 | 1308 | |
03485f2a VY |
1309 | if (err > 0) |
1310 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1311 | release_sock(sk); | |
1312 | ||
1313 | release_dst: | |
a5e7c210 DM |
1314 | if (dst) { |
1315 | if (connected) { | |
1316 | ip6_dst_store(sk, dst, | |
efe4208f ED |
1317 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
1318 | &sk->sk_v6_daddr : NULL, | |
8e1ef0a9 | 1319 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 1320 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
1321 | &np->saddr : |
1322 | #endif | |
1323 | NULL); | |
a5e7c210 DM |
1324 | } else { |
1325 | dst_release(dst); | |
1326 | } | |
a3c96089 | 1327 | dst = NULL; |
a5e7c210 DM |
1328 | } |
1329 | ||
1da177e4 | 1330 | out: |
a3c96089 | 1331 | dst_release(dst); |
1da177e4 | 1332 | fl6_sock_release(flowlabel); |
45f6fad8 | 1333 | txopt_put(opt_to_free); |
cd562c98 | 1334 | if (!err) |
1da177e4 | 1335 | return len; |
a18135eb DM |
1336 | /* |
1337 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1338 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1339 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1340 | * things). We could add another new stat but at least for now that | |
1341 | * seems like overkill. | |
1342 | */ | |
1343 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
6aef70a8 ED |
1344 | UDP6_INC_STATS(sock_net(sk), |
1345 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1346 | } |
1da177e4 LT |
1347 | return err; |
1348 | ||
1349 | do_confirm: | |
1350 | dst_confirm(dst); | |
1351 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
1352 | goto back_from_confirm; | |
1353 | err = 0; | |
1354 | goto out; | |
1355 | } | |
1356 | ||
7d06b2e0 | 1357 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1358 | { |
44046a59 | 1359 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
1360 | lock_sock(sk); |
1361 | udp_v6_flush_pending_frames(sk); | |
1362 | release_sock(sk); | |
1363 | ||
44046a59 TP |
1364 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
1365 | void (*encap_destroy)(struct sock *sk); | |
1366 | encap_destroy = ACCESS_ONCE(up->encap_destroy); | |
1367 | if (encap_destroy) | |
1368 | encap_destroy(sk); | |
1369 | } | |
1370 | ||
1da177e4 | 1371 | inet6_destroy_sock(sk); |
1da177e4 LT |
1372 | } |
1373 | ||
1374 | /* | |
1375 | * Socket option code for UDP | |
1376 | */ | |
ba4e58ec | 1377 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1378 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1379 | { |
db8dac20 | 1380 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1381 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1382 | udp_v6_push_pending_frames); | |
ba4e58ec | 1383 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1384 | } |
1385 | ||
1386 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1387 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1388 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1389 | { |
db8dac20 | 1390 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1391 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1392 | udp_v6_push_pending_frames); | |
ba4e58ec | 1393 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1394 | } |
1395 | #endif | |
1396 | ||
ba4e58ec GR |
1397 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1398 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1399 | { |
db8dac20 | 1400 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1401 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1402 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1403 | } |
1404 | ||
1405 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1406 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1407 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1408 | { |
db8dac20 | 1409 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1410 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1411 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1412 | } |
1413 | #endif | |
1414 | ||
41135cc8 | 1415 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1416 | .handler = udpv6_rcv, |
1417 | .err_handler = udpv6_err, | |
1418 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1419 | }; | |
1420 | ||
1421 | /* ------------------------------------------------------------------------ */ | |
1422 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1423 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1424 | { |
17ef66af LC |
1425 | if (v == SEQ_START_TOKEN) { |
1426 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1427 | } else { | |
1428 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
1429 | struct inet_sock *inet = inet_sk(v); | |
1430 | __u16 srcp = ntohs(inet->inet_sport); | |
1431 | __u16 destp = ntohs(inet->inet_dport); | |
1432 | ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); | |
1433 | } | |
1da177e4 LT |
1434 | return 0; |
1435 | } | |
1436 | ||
73cb88ec AV |
1437 | static const struct file_operations udp6_afinfo_seq_fops = { |
1438 | .owner = THIS_MODULE, | |
1439 | .open = udp_seq_open, | |
1440 | .read = seq_read, | |
1441 | .llseek = seq_lseek, | |
1442 | .release = seq_release_net | |
1443 | }; | |
1444 | ||
1da177e4 | 1445 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1446 | .name = "udp6", |
1447 | .family = AF_INET6, | |
645ca708 | 1448 | .udp_table = &udp_table, |
73cb88ec | 1449 | .seq_fops = &udp6_afinfo_seq_fops, |
dda61925 DL |
1450 | .seq_ops = { |
1451 | .show = udp6_seq_show, | |
1452 | }, | |
1da177e4 LT |
1453 | }; |
1454 | ||
2c8c1e72 | 1455 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1456 | { |
0c96d8c5 | 1457 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1458 | } |
1459 | ||
ec120da6 IM |
1460 | void udp6_proc_exit(struct net *net) |
1461 | { | |
0c96d8c5 | 1462 | udp_proc_unregister(net, &udp6_seq_afinfo); |
1da177e4 LT |
1463 | } |
1464 | #endif /* CONFIG_PROC_FS */ | |
1465 | ||
f77d6021 ED |
1466 | void udp_v6_clear_sk(struct sock *sk, int size) |
1467 | { | |
1468 | struct inet_sock *inet = inet_sk(sk); | |
1469 | ||
1470 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1471 | sk_prot_clear_portaddr_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1472 | ||
1473 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1474 | memset(&inet->pinet6 + 1, 0, size); | |
1475 | } | |
1476 | ||
1da177e4 LT |
1477 | /* ------------------------------------------------------------------------ */ |
1478 | ||
1479 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1480 | .name = "UDPv6", |
1481 | .owner = THIS_MODULE, | |
ba4e58ec | 1482 | .close = udp_lib_close, |
543d9cfe ACM |
1483 | .connect = ip6_datagram_connect, |
1484 | .disconnect = udp_disconnect, | |
1485 | .ioctl = udp_ioctl, | |
1486 | .destroy = udpv6_destroy_sock, | |
1487 | .setsockopt = udpv6_setsockopt, | |
1488 | .getsockopt = udpv6_getsockopt, | |
1489 | .sendmsg = udpv6_sendmsg, | |
1490 | .recvmsg = udpv6_recvmsg, | |
f7ad74fe | 1491 | .backlog_rcv = __udpv6_queue_rcv_skb, |
e646b657 | 1492 | .release_cb = ip6_datagram_release_cb, |
ba4e58ec GR |
1493 | .hash = udp_lib_hash, |
1494 | .unhash = udp_lib_unhash, | |
719f8358 | 1495 | .rehash = udp_v6_rehash, |
543d9cfe | 1496 | .get_port = udp_v6_get_port, |
95766fff HA |
1497 | .memory_allocated = &udp_memory_allocated, |
1498 | .sysctl_mem = sysctl_udp_mem, | |
1499 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1500 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1501 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1502 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1503 | .h.udp_table = &udp_table, |
3fdadf7d | 1504 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1505 | .compat_setsockopt = compat_udpv6_setsockopt, |
1506 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1507 | #endif |
f77d6021 | 1508 | .clear_sk = udp_v6_clear_sk, |
1da177e4 LT |
1509 | }; |
1510 | ||
1da177e4 LT |
1511 | static struct inet_protosw udpv6_protosw = { |
1512 | .type = SOCK_DGRAM, | |
1513 | .protocol = IPPROTO_UDP, | |
1514 | .prot = &udpv6_prot, | |
1515 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1516 | .flags = INET_PROTOSW_PERMANENT, |
1517 | }; | |
1518 | ||
7f4e4868 | 1519 | int __init udpv6_init(void) |
1da177e4 | 1520 | { |
7f4e4868 DL |
1521 | int ret; |
1522 | ||
3336288a VY |
1523 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1524 | if (ret) | |
c6b641a4 | 1525 | goto out; |
3336288a | 1526 | |
7f4e4868 DL |
1527 | ret = inet6_register_protosw(&udpv6_protosw); |
1528 | if (ret) | |
1529 | goto out_udpv6_protocol; | |
1530 | out: | |
1531 | return ret; | |
1532 | ||
1533 | out_udpv6_protocol: | |
1534 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1535 | goto out; | |
1536 | } | |
1537 | ||
09f7709f | 1538 | void udpv6_exit(void) |
7f4e4868 DL |
1539 | { |
1540 | inet6_unregister_protosw(&udpv6_protosw); | |
1541 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1542 | } |